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Two-dimensional colloidal halide perovskite nanocrystals are promisingmaterials for light emitting applications. In addition, they can be used ascomponents to create a variety of materials through physical and chemicaltransformations. Recent studies focused on nanoplatelets that are able toself-assemble and transform on solid substrates. Yet, the mechanism behind theprocess and the atomic arrangement of their assemblies remain unclear. Here, wepresent the transformation of self-assembled stacks of CsPbBr$_3$ nanoplateletsin solution, capturing the different stages of the process by keeping thesolutions at room temperature and monitoring the nanocrystal morphology over aperiod of a few months. Using ex-situ transmission electron microscopy andsurface analysis, we demonstrate that the transformation mechanism can beunderstood as oriented attachment, proceeding through the following steps: i)desorption of the ligands from the particles surfaces, causing the merging ofnanoplatelet stacks, which first form nanobelts; ii) merging of neighboringnanobelts that form more extended nanoplates; and iii) attachment of nanobeltsand nanoplates, which create objects with an atomic structure that resemble amosaic made of broken nanotiles. We reveal that the starting nanoplateletsmerge seamlessly and defect-free on an atomic scale in small and thinnanobelts. However, aged nanobelts and nanoplates, which are mainly stabilizedby amine/ammonium ions, link through a bilayer of CsBr. In this case, theatomic columns of neighboring perovskite lattices shift by a half-unit-cell,forming Ruddlesden-Popper planar faults.

Temperature Driven Transformation of CsPbBr$_3$ Nanoplatelets into Mosaic Nanotiles in Solution through Self-Assembly